X-Ray Emitting Planetary Nebulae Cycle 4 High

Details X-Ray Emitting Planetary Nebulae Cycle 4 High X-Ray Emitting Planetary Nebulae Cycle 4 High

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5403h&link_type=abstract

HST Proposal ID #5403

Astronomy and Astrophysics

Astrophysics

Hst Proposal Id #5403 Interstellar Medium Planetary Nebulae

Scientific paper

The ROSAT X-ray satellite detected for the first time hot, X-ray emitting gas from from a number of planetary nebulae (PNe). This hot gas is produced in the dynamical interaction of fast stellar winds with the nebular gas. The interaction is poorly understood -- PN dynamical models had failed to predict X-ray emission from PNe. The most plausible hypothesis for the presence of X-ray emission involves stellar wind interactions with inhomogeneous media, leading to mass-loaded outflows. Because mass-loaded outflows are important in a broad astrophysical context, further studies of X-ray emitting PNe are warranted. We propose to study mass-loaded outflows in two optically bright, X-ray emitting PNe, NGC6543 and BD+30 3639, through WFPC2 imaging with a complete set of narrow-band filters. High quality, good signal-to-noise images would provide spectral (through image ratios) information on small angular scales where mass-loading and associated interface phenomena occur. We expect to find radiative shocks, cometary structures, bow-shocks and wind-blown tails, as suggested by numerous ground-based studies and our recent HST observations. Information on these small-scale structures is essential for X-ray emission modeling, and for understanding mass-loaded flows.

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